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This text is about spreading of information and influence in complex networks. Although previously considered similar and modeled in parallel approaches, there is now experimental evidence that epidemic and social spreading work in subtly different ways. While previously explored through modeling, there is currently an explosion of work on revealing the mechanisms underlying complex contagion based on big data and data-driven approaches. This volume consists of four parts. Part 1 is an Introduction, providing an accessible summary of the state of the art. Part 2 provides an overview of the central theoretical developments in the field. Part 3 describes the empirical work on observing spreading processes in real-world networks. Finally, Part 4 goes into detail with recent and exciting new developments: dedicated studies designed to measure specific aspects of the spreading processes, often using randomized control trials to isolate the network effect from confounders, such as homophily. Each contribution is authored by leading experts in the field. This volume, though based on technical selections of the most important results on complex spreading, remains quite accessible to the newly interested. The main benefit to the reader is that the topics are carefully structured to take the novice to the level of expert on the topic of social spreading processes. This book will be of great importance to a wide field: from researchers in physics, computer science, and sociology to professionals in public policy and public health.
Much research into financial contagion and systematic risks has been motivated by the finding that cross-market correlations (resp. coexceedances) between asset returns increase significantly during crisis periods. Is this increase due to an exogenous shock common to all markets (interdependence) or due to certain types of transmission of shocks between markets (contagion)? Darolles and Gourieroux explain that an attempt to convey contagion and causality in a static framework can be flawed due to identification problems; they provide a more precise definition of the notion of shock to strengthen the solution within a dynamic framework. This book covers the standard practice for defining shocks in SVAR models, impulse response functions, identitification issues, static and dynamic models, leading to the challenges of measurement of systematic risk and contagion, with interpretations of hedge fund survival and market liquidity risks - Features the standard practice of defining shocks to models to help you to define impulse response and dynamic consequences - Shows that identification of shocks can be solved in a dynamic framework, even within a linear perspective - Helps you to apply the models to portfolio management, risk monitoring, and the analysis of financial stability
A study of the phenomenon of emotion contagion, or the communication of mood to others.
An Observer Book of the Year A Times Science Book of the Year A New Statesman Book of the Year A Financial Times Science Book of the Year 'Astonishingly bold' Daily Mail 'It is hard to imagine a more timely book ... much of the modern world will make more sense having read it.' The Times We live in a world that's more interconnected than ever before. Our lives are shaped by outbreaks - of disease, of misinformation, even of violence - that appear, spread and fade away with bewildering speed. To understand them, we need to learn the hidden laws that govern them. From 'superspreaders' who might spark a pandemic or bring down a financial system to the social dynamics that make loneliness catch on, The Rules of Contagion offers compelling insights into human behaviour and explains how we can get better at predicting what happens next. Along the way, Adam Kucharski explores how innovations spread through friendship networks, what links computer viruses with folk stories - and why the most useful predictions aren't necessarily the ones that come true. Now revised and updated with content on Covid-19.
Infectious Ideas is a comparative analysis of how Muslim and Christian scholars explained the transmission of disease in the premodern Mediterranean world. How did religious communities respond to and make sense of epidemic disease? To answer this, historian Justin K. Stearns looks at how Muslim and Christian communities conceived of contagion, focusing especially on the Iberian Peninsula in the aftermath of the Black Death. What Stearns discovers calls into question recent scholarship on Muslim and Christian reactions to the plague and leprosy. Stearns shows that rather than universally reject the concept of contagion, as most scholars have affirmed, Muslim scholars engaged in creative and rational attempts to understand it. He explores how Christian scholars used the metaphor of contagion to define proper and safe interactions with heretics, Jews, and Muslims, and how contagion itself denoted phenomena as distinct as the evil eye and the effects of corrupted air. Stearns argues that at the heart of the work of both Muslims and Christians, although their approaches differed, was a desire to protect the physical and spiritual health of their respective communities. Based on Stearns's analysis of Muslim and Christian legal, theological, historical, and medical texts in Arabic, Medieval Castilian, and Latin, Infectious Ideas is the first book to offer a comparative discussion of concepts of contagion in the premodern Mediterranean world.
Picking up where The Tipping Point leaves off, respected journalist Lee Daniel Kravetz’s Strange Contagion is a provocative look at both the science and lived experience of social contagion. In 2009, tragedy struck the town of Palo Alto: A student from the local high school had died by suicide by stepping in front of an oncoming train. Grief-stricken, the community mourned what they thought was an isolated loss. Until, a few weeks later, it happened again. And again. And again. In six months, the high school lost five students to suicide at those train tracks. A recent transplant to the community and a new father himself, Lee Daniel Kravetz’s experience as a science journalist kicked in: what was causing this tragedy? More important, how was it possible that a suicide cluster could develop in a community of concerned, aware, hyper-vigilant adults? The answer? Social contagion. We all know that ideas, emotions, and actions are communicable—from mirroring someone’s posture to mimicking their speech patterns, we are all driven by unconscious motivations triggered by our environment. But when just the right physiological, psychological, and social factors come together, we get what Kravetz calls a "strange contagion:" a perfect storm of highly common social viruses that, combined, form a highly volatile condition. Strange Contagion is simultaneously a moving account of one community’s tragedy and a rigorous investigation of social phenomenon, as Kravetz draws on research and insights from experts worldwide to unlock the mystery of how ideas spread, why they take hold, and offer thoughts on our responsibility to one another as citizens of a globally and perpetually connected world.
Contagion as process, metaphor, and timely interpretive tool, from antiquity to the twenty-first century. Cultures of Contagion recounts episodes in the history of contagions, from ancient times to the twenty-first century. It considers contagion not only in the medical sense but also as a process, a metaphor, and an interpretive model--as a term that describes not only the transmission of a virus but also the propagation of a phenomenon. The authors describe a wide range of social, cultural, political, and anthropological instances through the prism of contagion--from anti-Semitism to migration, from the nuclear contamination of the planet to the violence of Mao's Red Guard. The book proceeds glossary style, with a series of short texts arranged alphabetically, beginning with an entry on aluminum and "environmental contagion" and ending with a discussion of writing and "textual resemblance" caused by influence, imitation, borrowing, and plagiarism. The authors--leading scholars associated with the Center for Historical Research (CRH, Centre de recherches historiques), Paris--consider such topics as the connection between contagion and suggestion, "waltzmania" in post-Terror Paris, the effect of reading on sensitive imaginations, and the contagiousness of yawning. They take two distinct approaches: either examining contagion and what it signified contemporaneously, or deploying contagion as an interpretive tool. Both perspectives illuminate unexpected connections, unnoticed configurations, and invisible interactions.
This volume presents a unified mathematical framework for the transmission channels for damaging shocks that can lead to instability in financial systems. As the title suggests, financial contagion is analogous to the spread of disease, and damaging financial crises may be better understood by bringing to bear ideas from studying other complex systems in our world. After considering how people have viewed financial crises and systemic risk in the past, it delves into the mechanics of the interactions between banking counterparties. It finds a common mathematical structure for types of crises that proceed through cascade mappings that approach a cascade equilibrium. Later chapters follow this theme, starting from the underlying random skeleton graph, developing into the theory of bootstrap percolation, ultimately leading to techniques that can determine the large scale nature of contagious financial cascades.
DIVShows how narratives of contagion structure communities of belonging and how the lessons of these narratives are incorporated into sociological theories of cultural transmission and community formation./div